Vacuum tube electrode



March 19, 1935. A, HASLAUER 1,995,178

,VACUUM TUBE ELECTRODE Filed Jan. 17, 1934 maar. vAmuvAvAu C INVENTOR 15- n 1Q ADOLF HAsLAul-:R

ATTORNEY Patented Mar.1`9,1935 l tu i UNITED STATES PATENT OFFICE'v -y -`1,995,17s Y VACUUMTUBE ELECTRODE Adolf Haslauer, East Orange, N. J.

Application January 17, 1934, SerialNo.- '706,916V 1o claims. (c1. 25o-27.5) l A This invention relates to new and useful im- Fig. 2 is -a'plan view of Fig. 1. provements in vacuum tube electrodes. Fig. Bis a horizontal sectional view taken on The invention has for an` object the constructhe line'3-3 of Fig. 1. 'f tion of a so called screen grid of a screen grid Fig. l is a vertical sectional View of a Yscreen 5 audion wherein the screen grid comprises a cylingrid according to a modification of this inven- 5 drical body and an end closure secured together tion. in a novel fashion. i Fig. 5 is a vplan view of the vcylindrical body `In the past it has been customary to construct used. in Fig. 4', illustrated per se. screen grids Ycomprising a cylindrical bodyland Fig. 6 is a sectional viewY of another screen 10 an end closure by soldering or clamping the edges grid constructed according to a still further 10 of the closure and cylindrical body together. In modied'form of this invention. cases where'soldering was resorted to the con- Fig. 7 is aplanview of the cylindrical body struction involved great expense in Y that this used in Fig. 6 illustrated per se. was mainly a hand operation. AIn cases Where Fig. 8 is a sectional view of another screen l5v clamping of the edges was resorted to, these grid constructed according to a still further 15 constructions did not take into account the tact modied form of vthis invention. that the Vscreen grid is heated duringmanufac- Fig. 9 isa sectional view of still another screen ture and becomes heated, when in use,` and exgrid constructed according to a still further pansion due to these heats vtends and does loosen modification of this invention. and disconnect the two parts thereof.Y The Yscreen grid according to this invention 20 .'Ihisinventionparticularly proposes constructcomprises a perforated sheet metal or screen ing the junction between the metal closure memf cylinder 10 having a turned edge 11 on oneend ber Yand the cylindrical body in such a manneras serving as `a reinforcement to stiffen said' end, not to'be affected bythe heat produced Vby theY and a metal Vclosure member 12 Aover said endV vacuum tube during operation. and having its edge 13l turned over said rein- 25 ,Still further the invention particularly proforcement edge. The cylinder 10 is formed from poses an arrangement whereby the edge of the a sheet of material Vbent into cylindrical form cylindrical body is rst reinforced by. a beaded and having its edges 14 interengaged by bending construction which in addition acts to enlarge the `ends upon Veach other asclearly illustrated the edge so that the closure member may be satin Fig. 3. The closure member 12 is formed with 30 isfactorily connected therewith vin a manner not av central vopening 15 from which prongs 16 e'xto come apart during heating orhandling ofthe tend'upwards by means of which the screen grid electrode. Further the invention proposes formmay be mounted upon suitable parts in the ing the closure member with a lbent areato furaudion.

ther hold the edge of the cylindrical body from The turned edge '11 is formed in a particular 35 i collapsing. Y Y manner in which the cross section is s ubstan;

Still further the invention proposes forming tially square and comprises a top continuation the edge of the cylindrical body in a manner so vfrom the upper edge of the cylinder 10, a ver-` as to be capable of' readily receiving the edge of tical continuation from theY outer edge ofthe 40 the closure to rmly clamp these parts together. top continuation and a' horizontalY inward ex- 40 in a superior manner than heretofore. tending continuation fromr the bottomr of said Still further the invention proposes the convertical continuation; 4".[his particular cross secstruction of an article as mentioned which is tion produces avery stiff .upper v'edge for the simple and durable and which may be manucylindrical member which customarily is .formed Y factured and soldat a reasonable cost. n fromv soft' metal such asaluminurn.r The ad- 45 For further comprehension of the invention, vantage of reinforcing the edge lies 'in the fact and of the objects and advantages thereof, refthat the possibility of collapsing Vthe upper end erence will be hadto the following description of the cylinder during handling' or useis thus and accompanying drawing, and to the appended .reduced if not entirely eliminated.

claims inwhich the various novel features of the Thebent edge 13 of the closure member 12 50 invention are more particularly set forth.' extends 'over the top continuation of theturned In the accompanying drawing forming a maedgejll, then extends downwards over the side A terial part of this disclosure: continuation oftheturned edge 1l and nally in- Fig. I is a vertical sectional view of a screen wards underthe bottominward extendedy portion grid constructed according to this invention. of the turned edge 11s An indented area 12 in 55 the closure member 12 engages against the reinforced end of the cylinder to further reinforce the end of the cylinder. With this arrangement the junction between the cylinder and the closure member is such as to hold these parts together mechanically as well as electrically. If during use the closure 12 becomes heated and expands more than the cylinder 10, because of the inturned bottom edges of the turned edges l1 and the edge 13 of the closure, disconnection of these parts isA impossible.

In Figs. 4 and 5 a modied form o-f the invention has been disclosed wherein a different structure is provided for holding the closure member and the cylinder together. The cylinder 10 is shown provided with a top turned edge 11 and comprises a top horizontal. continuation from the top of the cylindrical member and connecting with a side continuation extending down-' wards only. The closure member 12 has an edge 13 which is bent downwards outside of the side continuation of the bent edge 11 and then around up over the bottom edge of the side continuation. With this arrangement the closure l2 cannot possibly be disconnected from the cylindrical member during handling or during use when there is expansion due to the operation of the audion tube.

In practice it will be found that the side continuation of the edge 11' will necessarilyl have to be spaced materially fromY the outer face of the cylinder 10 in order to allow the edge of the turned edge 13 to engage the back side thereof. Since the metal of the cylinder 10 could not possibly expand so great a distance, it is necessary to form the upper end of the cylinder mem-` ber 10 with a plurality of cuts 18 around its periphery. These cuts will divide off segmental portions of the turned edge 11' so that any desired amount of turning may be produced. The closure member 12 in addition to closing the upper end of the cylinder 10 also covers all of the slots 18 so that in the completed article these slots are not readily viewable.

In Figs. 6 and 7 another embodiment of the invention has been disclosed wherein the cylinder 10 is provided with a radially outturnedtop edge 11a.v This top edge is formed with a plurality of slits 18 for the purpose of not relying upon the expansion of the metal to allow the outturning. With this arrangement it is possible to extend the outturned edge'llartoany de'- sired degree. A closure 12 'is mounted upon the cylinder 10 and has a turned edge 13a which extends around the outer edge of the` outturned edge 11a. With this arrangement the edgeslla and 13a may engage each other for asubstantially radial distance so that irrespective of any difference in expansion between the closure member 'and the cylinder' these edges will still engage and holdV each other. f i' In Fig. 8 another embodimentof the Ainvention has been disclosed'whereinthe cylinder 10 is provided with aradially outturned top edge 11b of Va size permitted by the expanding qualities of the material so that radial slits such as 18 are not necessary. A closure 1.2 is mounted upon the cylinder 10 and has a turned edge 13b which extends around the outturned edge 1lb. In addition the closure 12 is provided with an in dented area 12b" in intimate contact with the inner portion of the outturned edge 11b. This indented area is of circular shape and serves to hold thev upper edge of the cylinder 10 reinforced against possibly being caved in during handling or in use. Still further this construction is such as to be rigid mechanically and satisfactory electrically during use irrespective of the temperature to which it may be subjected.

In Fig. 9 another embodiment of the invention has been disclosed which is very similar to that illustrated in Fig. 8 except for the fact that the edges 11c of the cylinder 10 is extended downwards at an inclination.` The edge 13 of the closure 12 is also extended downwards at an angle and bent around the edge 11C. In other respects this form is similar to the previous form and similar parts may be recognized by corresponding reference numerals.

'While I have shown and described the preferred embodiment of my invention, it is to be understood.. that I do'not limit myself to the precise construction herein disclosed and the right is reserved to all changes and modifications coming withinl the scope of the invention as defined in the appendedclaims.

Having thus described my invention, what I claim as new and desire 'to secure by United StatesLettersPatent is:--l A 1 1. In a vacuumftube-electrode, a junction Vbetween a cylinder and closure memben-comprising a metal material Vcylinder'havingfa Vturned edge onone end serving asa reinforcement to stiifen said end, and a metal closure member over said end, having an edge turned Aoversaid reinforced edge. a

v'2. In a vacuum tube electrode,l a junction between a cylinder and closure member, comprising a metal material'cylinder-having aturned edge on one endj serving as areinforcement to' stiifen said endfand a metal closure'member over said end, having jan edge turned overA said reinforced edge, said turned edge of the cylinder comprising a top' horizontal continuation joining with a downward extended vertical continuation in turn joining with an inturned-*bottom horizontal continuation. Y

' 3. In a vacuum tube electrode, a junction between a cylinder and closure member, comprising a metal material cylinder having a turned edge on one end serving as a reinforcement torstiffen said end, anda metal closure member over said end, having-an edge turned over said reinforced edge, said turned edge of the cylinder comprising a top horizontal continuation joining with a downward extended vertical continuation in turn joiningwith an inturned bottom horizontal continuation, and the edge ofsaid closure member extending down-upon the outer face of said side continuation and under the bottom face of said inturned bottom continuation.

4. In ya vacuum tube electrode, a junction between a cylinder and closure member, comprising on one end serving as a reinforcement to stifen said end, and a metal closure member oversaid end, having an'edge turned over said reinforced edge, the turned edge of said cylinder comprising a top horizontal continuation connecting with a side vertical continuation. Q

5. In avacuurn tubeelectrode, a'junction between a cylinder and closure member, comprising Va metal material cylinderhaving a turned edge on one end serving as a reinforcement to stiffen said end/and a .metal closure member over said end, having an edge turnedover said reinforced edge, the turned edge of said; cylinder comprising atopkhorizontal continuation connecting with a side vertical continuation, and the edge of said closure member extending down upon the outer face of said side continuation around the bottom edge thereof and upwards upon the inner face of said side continuation.

6. In a vacuum tube electrode, a junction between a cylinder and closure member, comprising a metal material cylinder having a turned edge on one end serving as a reinforcement to stiffen said end, and a metal closure member over said end, having an edge turnedover said reinforced edge, the turned edge of said cylinder comprising a. top horizontal continuation connecting with a side vertical continuation, and the edge of said closure member extending down upon the outer face of said side continuation around the bottom edge thereof and upwards upon the inner face of Y said side continuation, said turned edge of said cylinder being formed with a plurality of slits for the purpose of eliminating the necessity ofl turned Vradial edge serving as a reinforcement to stiffen the end thereof, and a closure member over said end and having an edge turned over said outward extending edge, the outward extending edge of said cylinder being formed with a kplurality of peripheral slits to eliminate the necessity of the metal stretching and thus allowing a large size fo-r said edge.

9. In a vacuum tube electrode, a junction between'a cylinder and closure member, comprising a metalmaterial cylinder having a turned edge on one end serving as a reinforcement to stiifen said end, and a metal closure member over said end, having an edge turned over said reinforced edge, and formed with an indented portion encircling the inner area of the turned edge of said cylinder for further reinforcing the end of the cylinder.

10. In a vacuum tube electrode, a junction between a cylinder and closure member, comprising a metal material cylinder having a turned edge on one end serving as a reinforcement to stiffen said end, and a metal closure member over said end,

, having an edge turned over said reinforced edge,

and formed with an indented portion encircling the inner area of the turned edge of said cylinder for further reinforcing the end of the cylinder,

the turned edges of the cylinder and closure mem- A' ber being bent downwards at an inclination.

ADOLF HASLAUER. 

